docs: fix PPR for AMD EPYC broken link

docs: fix PPR for AMD EPYC broken link

As 'AMD Documentation Hub' [1] announced: "All technical documentation,
including for AMD EPYC™ processors ..., and more is now hosted on the
AMD Technical Information Portal (TIP) [2]".

By searching the No.55898, update the new URL.

[1] https://www.amd.com/en/search/documentation/hub.html
[2] https://docs.amd.com/

Signed-off-by: Haiyue Wang <haiyuewa@163.com>
Acked-by: Bagas Sanjaya <bagasdotme@gmail.com>
Link: https://patch.msgid.link/20251230133101.14362-1-haiyuewa@163.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>